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You said There is no specific regulation stating that a dp protective device is required for a tt with an upstream s type rcd.I have never stated dp rcbo's MUST be used where an upfront rcd is in service, if you read back through my posts I clearly agree other options are compliant such as a dual rcd board.
What I do state (very clearly I believe) and stand by is that wherre rcbo's ARE used......they must be dp where there is a upstream s type rcd and in that arrangement are effectively a requirement, you seem incapable of understanding that I am only refering to where rcbo's ARE used. I believe i have been quite clear that with other arrangements sp rcbo's are compliant.
Perhaps you would be good enough Mainline to answer this.
Lets say you have a job where the designer has specified DB's with rcbo protection to all final circuits. A main switch of s type rcd is also specified. Its a TT earthing system.
Would you install sp rcbo's and provide an EIC on completion?
Which was my point from the start.
That it’s Not a requirement.
@westward posted the same statement as I was typing saying dp rcbos aren’t a requirement and your reply was yes they are and proceeded to try and find a situation where they would be an actual requirement which has now come down to a designer telling you to fit them
You can go through all the scenarios you like where the use of them is going to be the sensible thing to do but That would still not make it a requirement.
If a main switch rcd is within the enclosure I would be questioning the competence of the designer
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